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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Magnesia-Silica Oxides: Effect of Mg/Si Ratio and Sulfate on Acidity (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 321-325 
    Details
    ISSN: 1573-4846
    Keywords: magnesia-silica mixed oxides ; sol-gel magnesia-silica ; magnesia-silica acidity ; sulfated magnesia-silica ; isopropanol decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mg-Si binary oxides were prepared by the sol-gel method, using magnesium diethoxide and tetraethoxysilane as starting materials. Mg-Si mixed oxides were prepared at pH3 and 9 at nominal concentrations of 1.3, 4.0, and 6.7 mole% MgO. Density and strength of the acid sites were determined by pyridine thermal programmed desorption. Comparable Lewis acidity was found in pH3 and 9 preparations. However, when the samples were sulfated with sulfuric acid, strong Bronsted acidity was developed, reaching a maximum at 6.7 mole% MgO. The strong acidity of sulfated samples was corroborated using the isopropanol decomposition reaction as catalytic test. Similar conversions are obtained at 100°C on sulfated samples, whereas 260°C are required for non-sulfated ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026487018502
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Tin Precursor on the Catalytic Properties of Pt-Sn/Al2O3 Sol-Gel Prepared Catalysts (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 847-849 
    Details
    ISSN: 1573-4846
    Keywords: platinum-tin catalysts ; Pt-Sn sol-gel catalysts ; cyclohexane dehydrogenation ; n-hexane conversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tin-alumina supports were prepared by cogelation of aluminum tri-sec-butoxide and tetrabutyltin or tin tetrachloride. Aqueous or acetone platinum solutions were used for impregnation. The results show that the specific surface area and the acidity of the catalysts were only slightly modified by the metal precursors used. On cyclohexane dehydrogenation and n-hexane conversion, high selectivity to olefins and low cracking products were detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018362813843
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of magnesia-silica oxides: Effect of Mg/Si ratio and sulfate on acidity (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 321-325 
    Details
    ISSN: 1573-4846
    Keywords: magnesia-silica mixed oxides ; sol-gel magnesia-silica ; magnesia-silica acidity ; sulfated magnesiasilica ; isopropanol decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mg−Si binary oxides were prepared by the sol-gel method, using magnesium diethoxide and tetraethoxysilane as starting materials. Mg−Si mixed oxides were prepared at pH3 and 9 at nominal concentrations of 1.3, 4.0, and 6.7 mole% MgO. Density and strength of the acid sites were determined by pyridine thermal programmed desorption. Comparable Lewis acidity was found in pH3 and 9 preparations. However, when the samples were sulfated with sulfuric acid, strong Bronsted acidity was developed, reaching a maximum at 6.7 mole% MgO. The strong acidity of sulfated samples was corroborated using the isopropanol decomposition reaction as catalytic test. Similar conversions are obtained at 100°C on sulfated samples, whereas 260°C are required for non-sulfated ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436859
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of tin precursor on the catalytic properties of Pt-Sn/Al2O3 sol-gel prepared catalysts (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 847-849 
    Details
    ISSN: 1573-4846
    Keywords: platinum-tin catalysts ; Pt-Sn sol-gel catalysts ; cyclohexane dehydrogenation ; n-hexane conversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tin-alumina supports were prepared by cogelation of aluminum tri-sec-butoxide and tetrabutyltin or tin tetrachloride. Aqueous or acetone platinum solutions were used for impregnation. The results show that the specific surface area and the acidity of the catalysts were only slightly modified by the metal precursors used. On cyclohexane dehydrogenation andn-hexane conversion, high selectivity to olefins and low cracking products were detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436949
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    Paper (German National Licenses)
    Fulltext
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